SpringBoot整合Redisson实现分布式锁

用Redisson框架实现Redis分布式锁

B站视频教学:https://www.bilibili.com/video/BV1np4y1i7DE?p=1

Redisson特性介绍

博客:https://www.jianshu.com/p/43cfa79e62a5

SpringBoot整合Redisson集群模式：

原文摘自:https://www.cnblogs.com/zengnansheng/p/11426996.html

1. maven依赖

<!-- redis-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<!--springboot2.0的redis整合包多出lettuce连接池，需要增加commons-pool2包
1.5的版本默认采用的连接池技术是jedis  2.0以上版本默认连接池是lettuce
spring boot 2.0 的操作手册有标注 大家可以去看看 地址是：https://docs.spring.io/spring-boot/docs/2.0.3.RELEASE/reference/htmlsingle-->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-pool2</artifactId>
    <version>2.4.2</version>
</dependency>

<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson</artifactId>
    <version>3.6.5</version>
</dependency>
<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.1.25.Final</version>
</dependency>
 <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-configuration-processor</artifactId>
 </dependency>

2. yml配置

redis:
    timeout: 6000ms
    password: '123456'
    cluster:
      max-redirects: 3  # 获取失败 最大重定向次数
      nodes:
        - 192.168.182.129:7001
        - 192.168.182.129:7002
        - 192.168.182.129:7003
        - 192.168.182.129:7004
        - 192.168.182.129:7005
        - 192.168.182.129:7006
    lettuce:
      pool:
        max-active: 1000  #连接池最大连接数（使用负值表示没有限制）
        max-idle: 10 # 连接池中的最大空闲连接
        min-idle: 5 # 连接池中的最小空闲连接
        max-wait: -1ms # 连接池最大阻塞等待时间（使用负值表示没有限制）

3. 增加一个RedisConfigProperties用于读取配置文件信息

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.List;

@Component
@ConfigurationProperties(prefix = "spring.redis")
public class RedisConfigProperties {
    private String password;
    private cluster cluster;

    public static class cluster {
        private List<String> nodes;

        public List<String> getNodes() {
            return nodes;
        }

        public void setNodes(List<String> nodes) {
            this.nodes = nodes;
        }
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public RedisConfigProperties.cluster getCluster() {
        return cluster;
    }

    public void setCluster(RedisConfigProperties.cluster cluster) {
        this.cluster = cluster;
    }
}

4. 增加RedissonConfig

import com.zns.properties.RedisConfigProperties;
import org.redisson.Redisson;
import org.redisson.config.ClusterServersConfig;
import org.redisson.config.Config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.ArrayList;
import java.util.List;

@Configuration
public class RedissonConfig {
    @Autowired
    private RedisConfigProperties redisConfigProperties;

    //添加redisson的bean
    @Bean
    public Redisson redisson() {
        //redisson版本是3.5，集群的ip前面要加上“redis://”，不然会报错，3.2版本可不加
        List<String> clusterNodes = new ArrayList<>();
        for (int i = 0; i < redisConfigProperties.getCluster().getNodes().size(); i++) {
            clusterNodes.add("redis://" + redisConfigProperties.getCluster().getNodes().get(i));
        }
        Config config = new Config();
        ClusterServersConfig clusterServersConfig = config.useClusterServers()
                .addNodeAddress(clusterNodes.toArray(new String[clusterNodes.size()]));
        clusterServersConfig.setPassword(redisConfigProperties.getPassword());//设置密码
        return (Redisson) Redisson.create(config);
    }
}

5. 测试类:

import org.redisson.Redisson;
import org.redisson.api.RLock;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

@RestController
@RequestMapping("")
public class RedisLockController {
    private static String product1Count = "product1Count";//商品1的数量key
    private static String lockKey = "testLockKey";//分布式锁的key
    @Autowired
    private StringRedisTemplate redisTemplate;
    @Autowired
    private Redisson redisson;

    /**
     * 初始化设置商品数量
     *
     * @return
     */
    @RequestMapping("/setProductCount")
    public String setValue() {
        redisTemplate.opsForValue().set(product1Count, "100");
        return "success";
    }

    /**
     * 模拟秒杀抢购，并发多个请求过来，查看是否出现超卖
     *
     * @return
     */
    @RequestMapping("/spike")
    public String spike() {
        String flag = "success";
        RLock lock = redisson.getLock(lockKey);
        try {
            //lock.lockAsync(5 , TimeUnit.SECONDS);
            //lock.lock(5, TimeUnit.SECONDS); //设置60秒自动释放锁  （默认是30秒自动过期）
            Future<Boolean> res = lock.tryLockAsync(100, 5, TimeUnit.SECONDS);
            boolean result = res.get();
            System.out.println("result:" + result);
            if (result) {
                int stock = Integer.parseInt(redisTemplate.opsForValue().get(product1Count).toString());
                if (stock > 0) {
                    redisTemplate.opsForValue().set(product1Count, (stock - 1) + "");
                } else {
                    flag = "fail";
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock(); //释放锁
        }
        return flag;
    }
}

SpringBoot整合Redisson单机模式

对上面第四点RedissonConfig进行修改:

@Bean
    public Redisson RedissonConfig(){
        Config config = new Config();
        config.useSingleServer().setAddress("redis://localhost:6379").setDatabase(0);
        return (Redisson) Redisson.create(config);
    }